This paper studies the nonlinear response of the term structure of interest rates to monetary policy shocks and presents a new stylized fact. We show that uncertainty about monetary policy changes the way the term structure responds to monetary policy. A policy tightening leads to a significantly smaller increase in long-term bond yields if policy uncertainty is high at the time of the shock. We also look at the decomposition of bond yields into expectations about future policy and the term premium. The weaker response of yields is driven by the fall in term premia, which fall more strongly if uncertainty about policy is high. Conditional on a monetary policy shock, higher uncertainty about monetary policy tends to make securities with longer maturities relatively more attractive to investors. As a consequence, investors demand even lower term premia. These findings are robust to the measurement of monetary policy uncertainty, the definition of the monetary policy shock, and to changing the model specification.JEL codes: E43, E58, G12 Keywords: monetary policy uncertainty, term structure, term premium, unconventional monetary policy, local projections.THE TERM STRUCTURE OF INTEREST rates, that is, the range of bond yields across the maturity spectrum, is closely tracked by central bankers and market participants. The reason for this is twofold. First, long-term interest rates should contain information about the public's expectations about future monetary policy. Central banks use the term structure to study the stance of monetary policy perceived by markets. Second, the term structure itself can be a policy target. allow for the effects of conventional and unconventional monetary policy shocks on yields to vary over time.